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Non-equilibrium relaxation in a stochastic lattice Lotka–Volterra model

Journal Article · · Physical Biology (Online)
 [1];  [2]
  1. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States); Virginia Tech, Department of Physics
  2. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
We employ Monte Carlo simulations to study a stochastic Lotka–Volterra model on a two-dimensional square lattice with periodic boundary conditions. If the (local) prey carrying capacity is finite, there exists an extinction threshold for the predator population that separates a stable active two-species coexistence phase from an inactive state wherein only prey survive. Holding all other rates fixed, we investigate the non-equilibrium relaxation of the predator density in the vicinity of the critical predation rate. As expected, we observe critical slowing-down, i.e., a power law dependence of the relaxation time on the predation rate, and algebraic decay of the predator density at the extinction critical point. Here, the numerically determined critical exponents are in accord with the established values of the directed percolation universality class. Following a sudden predation rate change to its critical value, one finds critical aging for the predator density autocorrelation function that is also governed by universal scaling exponents. This aging scaling signature of the active-to-absorbing state phase transition emerges at significantly earlier times than the stationary critical power laws, and could thus serve as an advanced indicator of the (predator) population's proximity to its extinction threshold.
Research Organization:
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
SC0002308
OSTI ID:
1855165
Alternate ID(s):
OSTI ID: 22758436
Journal Information:
Physical Biology (Online), Journal Name: Physical Biology (Online) Journal Issue: 2 Vol. 13; ISSN 1478-3975
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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Lineage space and the propensity of bacterial cells to undergo growth transitions journal August 2018
A stochastic analysis of the spatially extended May–Leonard model journal September 2017
Dynamical universality of the contact process journal February 2018
Lineage space and the propensity of bacterial cells to undergo growth transitions journal June 2018
Analytical treatment for cyclic three-state dynamics on static networks journal January 2020
Stochastic population dynamics in spatially extended predator-prey systems text January 2018

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